diff mbox series

[RFC,v4,17/27] mm: Introduce do_mmap_locked()

Message ID 20180921150351.20898-18-yu-cheng.yu@intel.com (mailing list archive)
State New, archived
Headers show
Series Control Flow Enforcement: Shadow Stack | expand

Commit Message

Yu-cheng Yu Sept. 21, 2018, 3:03 p.m. UTC 
There are a few places that need do_mmap() with mm->mmap_sem held.
Create an in-line function for that.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
---
 include/linux/mm.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index f40387ecd920..c4cc07baccda 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2318,6 +2318,24 @@  static inline void mm_populate(unsigned long addr, unsigned long len)
 static inline void mm_populate(unsigned long addr, unsigned long len) {}
 #endif
 
+static inline unsigned long do_mmap_locked(unsigned long addr,
+	unsigned long len, unsigned long prot, unsigned long flags,
+	vm_flags_t vm_flags)
+{
+	struct mm_struct *mm = current->mm;
+	unsigned long populate;
+
+	down_write(&mm->mmap_sem);
+	addr = do_mmap(NULL, addr, len, prot, flags, vm_flags, 0,
+		       &populate, NULL);
+	up_write(&mm->mmap_sem);
+
+	if (populate)
+		mm_populate(addr, populate);
+
+	return addr;
+}
+
 /* These take the mm semaphore themselves */
 extern int __must_check vm_brk(unsigned long, unsigned long);
 extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigned long);